Download fulltext - DiVA Portal

3.2.11
Conductanceprobe(C)
In the second series of experiments with the fast valve a cascade control
structurewasusedwithoutflowdensityandthetoppressureasthecontrolvariables.
Conductance probe was applied to measure the density of the outflow from the riser.
The probe has been calibrated by Kazemihatami (Kazemihatami 2012) very recently.
Theoutputoftheprobewasintheformofvoltage.Thecalibrationcurvepresentedby
Kazemihatamiwasusedtofindtherelationbetweenvoltageandholdup.Equation3.1
showsthisrelation.HmeansholdupandVmeansvoltage.
H  0.9857V Equation3.1
Thedensityofmixedflowisfoundfromtheequation3.2:
 m   water . H   air . 1  H  Equation3.2
Afterinsertingtherelatedvaluesintheaboveequation,thedensityofmixedflow
isfoundasafunctionofvoltage:
 m  984.513V  1.204 Equation3.3
Figure3.14:Theconductanceprobe
38